Merge commit 'origin/master' into for-linus/xen/master

* commit 'origin/master': (4825 commits)
  Fix build errors due to CONFIG_BRANCH_TRACER=y
  parport: Use the PCI IRQ if offered
  tty: jsm cleanups
  Adjust path to gpio headers
  KGDB_SERIAL_CONSOLE check for module
  Change KCONFIG name
  tty: Blackin CTS/RTS
  Change hardware flow control from poll to interrupt driven
  Add support for the MAX3100 SPI UART.
  lanana: assign a device name and numbering for MAX3100
  serqt: initial clean up pass for tty side
  tty: Use the generic RS485 ioctl on CRIS
  tty: Correct inline types for tty_driver_kref_get()
  splice: fix deadlock in splicing to file
  nilfs2: support nanosecond timestamp
  nilfs2: introduce secondary super block
  nilfs2: simplify handling of active state of segments
  nilfs2: mark minor flag for checkpoint created by internal operation
  nilfs2: clean up sketch file
  nilfs2: super block operations fix endian bug
  ...

Conflicts:
	arch/x86/include/asm/thread_info.h
	arch/x86/lguest/boot.c
	drivers/xen/manage.c

1 files changed, 17 insertions, 29 deletions

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 91c7b8636b8a..76993941cac9 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -253,45 +253,33 @@ good_area:
 #endif /* CONFIG_8xx */
 
 	if (is_exec) {
-#if !(defined(CONFIG_4xx) || defined(CONFIG_BOOKE))
-		/* protection fault */
+#ifdef CONFIG_PPC_STD_MMU
+		/* Protection fault on exec go straight to failure on
+		 * Hash based MMUs as they either don't support per-page
+		 * execute permission, or if they do, it's handled already
+		 * at the hash level. This test would probably have to
+		 * be removed if we change the way this works to make hash
+		 * processors use the same I/D cache coherency mechanism
+		 * as embedded.
+		 */
 		if (error_code & DSISR_PROTFAULT)
 			goto bad_area;
+#endif /* CONFIG_PPC_STD_MMU */
+
 		/*
 		 * Allow execution from readable areas if the MMU does not
 		 * provide separate controls over reading and executing.
+		 *
+		 * Note: That code used to not be enabled for 4xx/BookE.
+		 * It is now as I/D cache coherency for these is done at
+		 * set_pte_at() time and I see no reason why the test
+		 * below wouldn't be valid on those processors. This -may-
+		 * break programs compiled with a really old ABI though.
 		 */
 		if (!(vma->vm_flags & VM_EXEC) &&
 		    (cpu_has_feature(CPU_FTR_NOEXECUTE) ||
 		     !(vma->vm_flags & (VM_READ | VM_WRITE))))
 			goto bad_area;
-#else
-		pte_t *ptep;
-		pmd_t *pmdp;
-
-		/* Since 4xx/Book-E supports per-page execute permission,
-		 * we lazily flush dcache to icache. */
-		ptep = NULL;
-		if (get_pteptr(mm, address, &ptep, &pmdp)) {
-			spinlock_t *ptl = pte_lockptr(mm, pmdp);
-			spin_lock(ptl);
-			if (pte_present(*ptep)) {
-				struct page *page = pte_page(*ptep);
-
-				if (!test_bit(PG_arch_1, &page->flags)) {
-					flush_dcache_icache_page(page);
-					set_bit(PG_arch_1, &page->flags);
-				}
-				pte_update(ptep, 0, _PAGE_HWEXEC |
-					   _PAGE_ACCESSED);
-				local_flush_tlb_page(vma, address);
-				pte_unmap_unlock(ptep, ptl);
-				up_read(&mm->mmap_sem);
-				return 0;
-			}
-			pte_unmap_unlock(ptep, ptl);
-		}
-#endif
 	/* a write */
 	} else if (is_write) {
 		if (!(vma->vm_flags & VM_WRITE))